Thanks this is very helpful. But has anyone an existing example of a similar driver? I wasn't able find one in /bsps, maybe I didn't search long enough.
On Mon, 15 Jul 2019 at 08:47, Sebastian Huber < sebastian.hu...@embedded-brains.de> wrote: > On 14/07/2019 01:34, Joel Sherrill wrote: > > On Sat, Jul 13, 2019 at 1:42 PM Chris Johns <chr...@rtems.org > > <mailto:chr...@rtems.org>> wrote: > > > > > > > > On 13/7/19 5:16 pm, Nils Hölscher wrote: > > > Hi, > > > > > > After I made sure that my fdt is correct I wondered why the pruss > > was still not > > > accessible. > > > When I researched more about userspace drivers in Linux I found > > out, that I have > > > overseen the pru UIO module in Linux. > > > This is the part that links the PRUs to the /dev/uio[0-7]. > > > Which then would be used by the sources I currently use. > > > The UIO source is available here: > > > > https://github.com/beagleboard/linux/blob/3.8/drivers/uio/uio_pruss.c > > > However this requires the linux UIO lib to load the modules and > > abstract the > > > device into a file. > > > > > > While researching I also found that BSD has a PRU driver. > > > Also this driver is more feature rich as it support PRU debugging. > > > The sources can be found her: > > > https://bitbucket.org/rpaulo/libpru/src/default/ > > > Additionally I found these sources in the FreeBSD tree: > > > > > > https://github.com/freebsd/freebsd/blob/250e158ddf52459661439141407bca505d199c19/sys/arm/ti/ti_pruss.c > > > This code also registers the PRUs in /dev/. > > > On the other hand the BSD drivers have no documentation at all. > > > > > > These are the code lines that will fail without a file in /dev. > > > Linux: > > https://github.com/nilhoel1/rtems-pru/blob/master/ti/prussdrv.c#L265 > > > BSD: > > > https://bitbucket.org/rpaulo/libpru/src/5cb7271533a96d177e73492f7cc40fa4b28396a5/ti-pru.c#lines-614 > > > > > > So my questions are: > > > 1. How are drivers registered to /dev in RTEMS? (examples) > > > > I suggest you look at cpukit/include/rtems/io.h and then for > > examples of this > > interface being used in the bsp directory. > > > > > > There is a helper in the IO Manager which is implemented as a call to > > mknod() > > which is a standard call. > > > In libbsd devices should be added with IMFS_make_generic_node(): > > freebsd/sys/net/bpf.c: rv = IMFS_make_generic_node("/dev/bpf", mode, > &bpf_imfs_control, NULL); > freebsd/sys/kern/uipc_usrreq.c: rv = IMFS_make_generic_node(soun->sun_path, > rtemsbsd/sys/fs/devfs/devfs_devs.c: rv = > IMFS_make_generic_node(dev->si_path, mode, &devfs_imfs_control, > > -- > Sebastian Huber, embedded brains GmbH > > Address : Dornierstr. 4, D-82178 Puchheim, Germany > Phone : +49 89 189 47 41-16 > Fax : +49 89 189 47 41-09 > E-Mail : sebastian.hu...@embedded-brains.de > PGP : Public key available on request. > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel
_______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
